Used in Rotimatic as implemented with WF121-A Module & PCB

Main Project Page: Rotimatic

WF121-A

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UART

Developer Guide Notes/Examples

WF121 Factory Configuration

WF121 Modules are factory shipped with settings listed below.

UART2 This UART gives access to BGAPI protocol, which can be used to control the WF121 Module from a separate host.

Pin 17: CTS
Pin 19: RTS
Pin 35: RX
Pin 36: TX
Baud rate 115200bps
Data bits 8
Parity bit none
Stop bit(s) 1
RTS/CTS enabled
RTS and CTS must be connected for the BGAPI communication to work properly.
UART1 is activated, but not accessed in the factory configuration.

The corresponding hardware configuration is shown below:

<?xml version="1.0" encoding="UTF-8" ?>
<hardware>
 <uart channel="0" baud="115200" api="false" />
 <uart channel="1" baud="115200" api="true" handshake="True" />
</hardware>

channel

0: UART channel 1
1: UART channel 2
Example:
- channel="0"

baud

Default: 57600
Range: 0-10000000
Some supported baud rates: 10000000, 5000000, 2500000, 2000000, 1000000, 115200, 57600
Example:
- baud="115200"

Notice that not all baud rates are possible. BGBuild compiler tries to find best match with least amount of error and outputs the result.

stopbits

Range: 1-2
Default: 1
Example:
- stopbits="2"

parity

Values:
- odd: use odd parity bit
- even: use even parity bit
- none: no parity bit
Default: none
Example:
- parity:"odd"

handshake

handshake RTS/CTS for data flow control

Values:
- true: RTS/CTS flow control is used
- false: RTS/CTS flow control is not used*
Default: false
Example:
- handshake="true"

api

Values:
- true: UART is used for BGAPI protocol
- false: UART is used for application data
Default: false
Example:
- api="true"

When using UART in streaming mode, it is highly recommend to use RTS api="false" /CTS data flow control (handshake="true") to ensure reliable data transfer. api UART is used for BGAPI protocol

When there should be an application receiving the BGAPI responses and events true at the host, otherwise the module might get stuck.

BGAPI / config

Using BGAPI over UART interface

The example below shows how to configure BGAPI to be used over UART2 interface with 115200 bps baud rate and hardware flow control.

<?xml version="1.0" encoding="UTF-8" ?>
<hardware>
 <uart channel="1" baud="115200" api="true" handshake="True" />
</hardware>

Using BGAPI over UART2 and enabling UART1 to BGScript application

The example below shows how to configure BGAPI to be used over UART2 interface and UART1 interface access is given to a BGScript application. This is used in multiple example applications delivered with the Bluegiga Wi-Fi Software. The purpose is for example to use UART1 for BGScript debugging and UART2 for DFU firmware updates.

<?xml version="1.0" encoding="UTF-8" ?>
<hardware>
 <uart channel="0" baud="115200" api="false" handshake="false" />
 <uart channel="1" baud="115200" api="True" handshake="True" />
</hardware>

BlueGiga WF121 WiFi

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